actually yes, my question was oriented mainly to the transmission, as engine has enough torque/power and trailer hook is not heavy at all (two-axle trailer) to be concerned about the load in the rear end.

i only think if anybody noticed anything abnormal with the transmission when towing something around 4000-4200 lbs. like dashboard warnings or, worst case, damages after towing

 

I don't condone towing over the legal limit, however in my market the CX-9's limit with trailer brakes is 2,000kg. ( 4409 pounds )

Assuming its got a solid rated towbar, you should be ok.

Are you aware of your GVM & GCM

https://l2sfbc.com/towing-weights-calculator/

 

What you are looking for is a member somewhere that is a simple DIY to tell you it's ok and no problems???t
The average DIY or owner will not know if they damaged their transmission unless they either did get a DTC or felt a shifting concern? And most are missed what is normal and of concern. The damage for any automatic is heat and will accumulate in most cases over the towing trip and generally the average operating temperatures will be in the high zone close to where automatics start to begin being damaged. About the only way to know this is either from a DTC, the transmission mechanically stops shifting properly or the signs in the oil from having it analyzed. So basically, you are rolling the dice whenever you tow and especially when you tow close to or above the stated rating by the OE.

And your engine and the model Mazda was not really designed power wise for what your are contemplating. You may get your trip accomplished but Mazda over rates their numbers and as such you think it has enough power but the reality is Mazda does not participate in the required certification to publish real numbers so like many auto manufactures they "fudge" the numbers. The turbocharger or I should say the ECU will keep the Turbo boosting psi to pull the load. This will have a domino effect as it will heat many aspect of the drivetrain. And to be sure your Mazda does not have monitoring on the dash for all the important engine operation to watch when towing at or close to the stated capacity..


Now I am sure on this or any other forum you post on with this question there will be members that tell you "NO PROBLES" "GO FOR IT" and they did the same with no problems. But then it's not their vehcle is it? lol.

If you were doing this correctly you would:
Install a separate Transmission cooler
Install an thermostatically controlled engine oil cooler
By-pass the OEM transmission fluid heater
Install the largest auxiliary fan you can fit into the engine bay
Run a radiator fan by-pass power switch or get a ECU calibration access device and change the factory radiator fan control settings
Get and Ultra Gauge or similar monitoring gauge/device


empiric experience auh sure.... More like a How-To do things the incorrect way IMHO on most automotive forums.


ASE

 

.hmm yea, maybe you´re right. For the cost of all that modifications it's better to get myself a 2nd or 3rd hand truck and use it only for that purpose

 

I did not want to discourage you and figured you could read between the lines of my first response? I also don't want to be included with the average members and their DIY comments. LOL

If you look on this forum you will find an oil analysis I had done with my Skyactiv transmission at less than approx.. 20k miles. Seeing this and knowing that is is absolutely the norm makes me wonder how Mazda calls these transmission lifetimes no service required??? lol Lifetime likely means 100k miles or when the warranty expires and then you start getting transmission problems from not servicing it on a regular basis.